Malignant fibrous histiocytoma is a type of soft tissue tumor that frequently occurs in the limbs, trunk, retroperitoneum, etc. We herein report a case of MFH occurring in the thoracic wall, which was accompanied by hemorrhage in the pleural cavity. A 79-year-old male transferred to our hospital for a detailed examination of a chest wall tumor in his right back. The tumor was diagnosed as pleomorphic malignant fibrous histiocytoma (MFH) by an incisional biopsy.